Not sure if this is the right forum to post in, but a friend of mine is outfitting a small (30ft) sailboat, which he and his wife live on, and he asked my advice in setting up a sound system. I am trying to spec out a car-audio based system (all the stuff actually made for boats is god awful expensive) with a simple mp3 head unit and 2 sets of 2- or 3-way speakers, two of which will be fixed inside the cabinet and two of which will movable from inside to outside, for chilling on the deck or what have you.
The whole boat runs on 12v power, but they will be at see for weeks and even months at a time, so keeping power usage to a minimum is critical. Space is also at a premium. They will likely listen to things at a low volume most of the time, but would like to be able to play stuff fairly loud when using the speakers outside.
With that in mind, what should I do to ensure the system is low in power consumption? Any recs for specific equipment?
Thanks in advance,